Fan Control Device with High Frequency PWM and Temperature Monitors
Datasheet
8.2.5
Register 3Eh: Company ID
Table 8.9 Register 3Eh: Company ID
Register
Address
Read/
Write
Bit 7
(MSb)
Bit 0
(LSb)
Default
Value
Register Name
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
3Eh
R
Company ID
7
6
5
4
3
2
1
0
5Ch
The Company ID register contains the company identification number. This number is a method for
uniquely identifying the part manufacturer.
This register is read only – a write to this register has no effect.
8.2.6
Register 3Fh: Version / Stepping
Table 8.10 Register 3Fh: Version / Stepping
Register
Address
Read/
Write
Bit 7
(MSb)
Bit 0
(LSb)
Default
Value
Register Name
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
3Fh
R
Version / Stepping
VER3
VER
2
VER
1
VER
0
STP
3
STP
2
STP
1
STP0
6Ah
The four least significant bits of the Version / Stepping register [3:0] contain the current stepping of the
EMC2300 silicon. Stepping numbers are to begin from a value of 08h, to indicate that the register set
is enhanced from previous hardware monitoring standards. The four most significant bits [7:4] reflect
the version number, which will be fixed at 0110b. For the A0 stepping of this device, the register will
read 01101000b. For the A1 stepping, this register will read 01101001b and so on.
The register is used by application software to identify which device has been implemented in the given
system. Based on this information, software can determine which registers to read from and write to.
Further, application software may use the current stepping to implement work-arounds for bugs found
in a specific silicon stepping. This register is read only – a write to this register has no effect.
8.2.7
Register 40h: Ready/Lock/Start Monitoring
Table 8.11 Register 40h: Ready/Lock/Start Monitoring
Register
Address
Read/
Write
Bit 7
(MSb)
Bit 0
(LSb)
Default
Value
Register Name
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
40h
R/W
Ready/Lock/Start
RES
RES
RES
RES
OVRID
READY
LOCK
START
00h
Setting the Lock bit makes the Lock bit read only.
SMSC EMC2300
Revision 0.2 (06-14-06)
DATA5S3HEET
SMSC [ SMSC CORPORATION ]
